Hexadecimal is a method of representing data in computers. It is different from the representation in our daily life. It consists of 0-9, A-F, and the letters are not case-sensitive. The corresponding relationship with the decimal system is: 0-9 corresponds to 0-9; A-F corresponds to 10-15; N-base numbers can be represented by numbers from 0 to (N-1), and numbers above 9 are represented by letters A-F. #BitcoinOurWorld（引用）